Electrical safety trip



June 12, 1928.

R. BONEBRAKE ELECTRICAL SAFETY TRIP Filed Sept. e, 1927 2 Sheets-Sheet 1Invgntor q T l Attornev June 12, 1928. 1,673,222

R. BONEBRAKE ELECTRICAL SAFETY TRIP Filed Sept. 8,, 1927 2 Sheets-Sheet2 Patented June 12, 1928.

BAX BQNEBRAKE, OF SOUTH \VHITLEY, INDIANA.

ELECTRICAL SAFETY mane.

Application filed September. 8, 1927. Serial No. 218,334. I

My invention relates to an electrical safety trip mechanism and the samehas more I particular reference to a safety trip for use in conjunctionwith book binding machines.

This mechanism is particularly adapted for installation on certain typesof machines, wherein the book sections pass through the process ofgathering, stitching, gluing and. covering stages.

Not only in this typeof machine, but in all types of book bindingmachines, 'considerable difficulty has been experienced in the irregularcarrying of the book section upon the various conveyors. In theproduction of large catalogues and other magazines, the same areconstructed of a group of sections,'each section comprising a uniformnumber of pages.

"These sections are usu-sally placed upon a platform provided for thepurpose, and in turn are caught'by-a gripper arm and placed upon anendless conveyor for movement-toward the stitcher. In, this line oftravel, the book:sections'frequently havektheir end portions, orcorners, curled against theside walls of the conveyor; In thiscondition, the book sections pass'onto the stitcher where they arestitched in their defective con dition.

Not onlyarebooks produced in this manner with defective sections, butnot infrequently, serious damage is done to various parts of thejbookbinding machine.

the electrical An object of-my safety trip mechanism is to entirelyeliminate any possibility that these defective sections will find theirway into finished catalogued magazines, the main purpose being to remedythis situation immediately upon its occurence.

Another object is in having my safety trip mechanism fool-proof, in thatthe book sections are compressed by a presser bar prior to their passageuntlermy trip device.

Still another object resides in the novel arrangement and constructionof parts I have provided for instantaneously breaking circuit andstopping the machine.

A further ob'ect lies in the convenient way in'which-t is --mechanismmay be applied to any part of an endless conveyor, requiring butaminimum of space and necessitating but lit-tle'labor and'time.

Other objects and advantages willbecome apparent as the novelconstruction of myinvention is better understood from the specificationand claims 110 follow.

In the drawing QFigure lis afront-elevation ofmyelectrical tripmechanisn'i'showing the same ap plied to the side wall of an endless conveyolf, the same further showing book sections on the endless conveyorand the presser bar of my mechanism in contact with one of the booksection. I

Fig. '2 is a sectional view through the circuit breaker housing of mymechanism, showing the contact of the breaker in closed position, and 7Fig. '3 's a perspective view of the con-. struction as shown in Figrl.

For a more detailed description of my invention, I will now refer to thedrawings, in which'like numerals'designatelike parts of myinvention. I

-An endless conveyor or other conveyingv means 1 of conventiona lconstruction, isen' s 1 ployed upon which 315 conveyed the same booksections A to "the stitcher, gluer 'and covering operations of, thebookbinding machine.

This endless conveyor is also 'provided with'aside wall 2 which is shownin Fig. 3, and on Which-my electrical trip mechanism 'is mounted. Letter'B'represents a plate of suitable shape having elongated ribs 3 andextending longitudinally 4 respectively, from the {lower edge of theplate fora substantial distance. f

The plate is further formed-with longitudinal slots 5 and 6andf7'respectively. .A

lug 8 projecting outwardly, is also provided onthe face of the'plateadjacent one side edge andintermediate the length of same.

A. rocker; arm-'9 "havingfthe lower portion thereof of a curved contour,is adapted .to

pivot on a threaded pin 10. The threaded pin 10 is provided with asuitable nut threaded thereon at the opposite side of the plate '13,which is not shown in the drawing and the same is adapted for slidableadjustment within the slot 7. I v

The curved portion of this arm adjusted below the pivot pin, is adaptedto abut the rib 1- on the plate, to limit the downward movement of thetrip plate 11 formed at the lowerextremity of the arm. The upper exnallythreaded opening,

tremity of the arm is formed with an interthrough which is threaded anadjusting with a suitable cam nut 13 for receiving the ,ad'usting screwin a desired position.

ivoted adjacent the top of the plate 13 is'a lever 14 formed with anenlarged head portion 15 in which is located anarcuateshaped slot 16.Freely movable within this,

slot 16 is a pin from which depends the rod 17. When the trip mechanismis in set position, the lower extremity of this rod 17 is jamb nutadapted to rest on the lug 8, in close proximity to, the extremity ofthe adjusting screw Extending beyond the pivot point of lever 14 isafinger 18 formed atits free end portion withan' outward bendaBar'section 19 20 to the lower part of the plate, Pivoted; in.

pivoted at is formed witha yoke head 21.-

this yoke is alink bar 22 which pivotally connectsv the bar, section 19,the switchplnnger'23; The switch plunger is internally threaded at itsopposite end into which an any desired shape, in which is located at,the

top inner side, an insulating plate 31,] se cured in a suitable manner.Carried by this insulating plate 31, are a pair of contact blocks 32 indirect overlying positionwith contact blocks 28. 1

Suitable conductor wires 33 are connected wit-lithe properelectricalmotive power of the machine. The presser barg iformed at oneend with a suitable plate 35 is adapted for adjustment within the-slot5. The pin 36 upon which the presser bar. is'allowed to pivotisprovidedwith a spring S'T for normally maintaining'the presserplate 35in tensioned' relation with the book section A. as a pass thereunder,upon the. conveyor 1.

Threaded bolts extend through the, side wall 2,.of the conveyor andthrough the slot 6 inplateB and are'provided with nuts 38 adapted to-betightened against the plates for securing same mproper position on thewall. w I V i In use, my trip mechanism is secured to the side wall 2of-the conveyorand is ad justed in proper position thereto through theslot 6 formed in the'plate. Presser bar 34 is then adjusted properly sothat the plate 35 .will efi'ectively'compress successive book sectionsas they pass thereunder.

Frequently, these book sections are inflated or bulky-and then must becompressed before they are allowed to pass under the screw 12 providedtrip plate 11. However, due to the edges of these book sections becomingcurled as shown in Fig. 3,.the same will engage the trip plate 11 tocause the same to pivot on the pin 10..

Then this movement takes place, the adjusting screw 12 will move towardsthe lower. extremity of bar 17 to cause the same to become displacedfrom support on the lug 8. As this occurs, the lever 14, which is ofweighted construction, will. swing downwardly causing the outwardlycurved freeend of finger 1810 engage the yoke portion of bar 19. p v

A slight engagement will cause this joint to break, allowing plunger 23todrop and in-turn separating the contact blocks 28 from the contact 32.This instantly breaks the circuit, causing the endless conveyor to stop,and allow the proper remedy for correcting the defective situation. Therib 3 serves to aline the arm and link sect-ion while my mechanism is inset posit-ion.

Proper adjustmentof adjusting screw 24 and jamb nut 25 may be made, foreffecting the proper tension of the leaf springs 27 with respect to thecontact blocks.

Having thus described my invention, what I claim as new is Y 1. In atrip mechanism for breaking an electrical circuit to the motive meansactuating an endless conveyor,-a trip arm adapted to be actuated by thepassage of an object on the conveyor, the weighted bar associated withthe plate and adapted to be released by the movement of the trip arm, alinked bar normally having its sections alined, said linked bar adaptedto be displaced from alinement by the movement of the weighted bar.

2. In a trip mechanism for breaking an electrical circuit comprising aplate, a trip arm, an abutment onthe-platefor engaging the end ofthe-trip arm, a linked bar having the sections thereof normallyinalinement, said linked sections adapted to be, displaced by themovement of thetrip arm,--an abutting rib on theplat-e for maintainingthe linked bar section normally in alinement when the mechanism is inset position, a platform mounted at the top of the plate, a switch meansarranged thereof and in operative connection with the linked bar.

3. In a trip mechanism for breaking an electrical circuit comprising alate, a trip arm, an abutment on the plate or engaging the end of thetrip arm, a-linked bar having the sections thereof normally inalinement, said linked sections adapted to be displaced bythe movementof the trip arm,an abut-' ting rib on the plate for maintaining thelinked bar section normally in alinement when the mechanism is in setposition, a platform mounted at the. top of the plate, a switch meansarranged thereon and in opera t-ive connection with the linked bar, saidswitch means comprising afixed contact block, a plunger adapted to bemoved by said linked bar, and ad usting screw threaded into one end ofsaid plunger, a movable contact block carried by said screw and adaptedto be adjusted in respect to the fixed contact, and resilient meansinterposed between the movable contact block and the fixed contactblock.

4. In a trip mechanism for breaking an electrical circuit comprising aplate, a trip arm, an abutment on the plate for engaging the movement ofthe trip arm, a linked bar having the sections thereof normally inalinement, said linked sect-ions adapted to be displaced by the movementof the trip arm, an abutting rib on the plate for maintaining the linkedbar section normally in alinement when the mechanism is in set position,a platform mounted at the top of the plate, a housing arranged upon saidplatform, a fixed contact block carried on the inner side of the top ofthe housing, a plunger connected at one end and with the linked bar, anadjust-ing screw threaded in the opposite end of the plunger, themovable contact carried by the adjusting screw, and resilient meansinterposed between the movable contact and the fixed contact.

5. In a trip mechanism for breaking an electrical circuit comprising aplate, a trip arm, an abutment on the plate for engaging the movement ofthe trip arm, a linked bar having the sections thereof normally inalinement with said link sections adapted to be displaced by themovement of the trip arm, an abutting rib on the plate for maintainingthe linked bar section normally in alinement when the mechanism is inset position, a platform mounted on the top of the plate, a pair offixed contact blocks supported over the platform, a plunger operativethrough said platform, a leaf spring supported on said plunger, and apair of movable contact blocks secured at opposite ends of the spring,and in direct underlying position with respect to the fixed contactblock.

In testimony whereof I aflix my signature.

RAY BONEBRAKE.

